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为了有效抑制航天器转动部件对敏感载荷的扰动,将电磁技术应用于变频吸振器上,从经典电磁理论出发,建立了斥力悬浮型电磁变频装置的数学模型。该型电磁变频装置通过两个电磁铁对中间的永磁体产生排斥作用来产生恢复力:当中间永磁体偏离平衡位置时,由于两边电磁铁斥力的非线性变化使得二者对中间永磁体产生一个指向平衡位置的恢复力。理论分析表明,在气隙不大的情况下,该力与永磁体偏离平衡位置的位移成正比,同时其与电磁铁中通入的电流成正比关系,进一步的仿真也验证了该结论,这为有效、精确控制变频吸振器的工作频率提供了理论依据。根据理论计算和有限元仿真,采用了电磁技术的变频装置可以提供4 500 N/m左右的刚度变化范围,应用该变频装置的吸振器可以提供近50 Hz的频率变化范围,同时其调节速度和精度也能满足航天器对变频吸振器相关性能的要求。
In order to effectively restrain the disturbance of the sensitive load caused by the rotating parts of the spacecraft, the electromagnetic technology is applied to the variable frequency vibration absorber. Based on the classical electromagnetic theory, the mathematical model of the repulsion suspended electromagnetic frequency conversion device is established. The electromagnetic frequency conversion device generates the restoring force through the repulsion of the two permanent magnets in the middle by the two electromagnets. When the intermediate permanent magnet deviates from the equilibrium position, the non-linear repulsion of the two electromagnets causes the two to generate a Restoring force to balance position. The theoretical analysis shows that in the case of small air gap, the force is proportional to the displacement of the permanent magnet from the equilibrium position and at the same time it is directly proportional to the current flowing in the electromagnet. Further simulation also verifies this conclusion. It provides a theoretical basis for the effective and precise control of the operating frequency of vibration absorbers. According to theoretical calculation and finite element simulation, the frequency conversion device adopting electromagnetic technology can provide a range of stiffness of about 4 500 N / m. The vibration absorber of the frequency conversion device can provide a frequency range of nearly 50 Hz. Meanwhile, the adjustment speed and The accuracy can also meet the requirements of spacecraft on the performance of variable frequency vibration absorber.